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Dec 16, 2009 - I have a 2007 Tucson, when you turn on the heater it only blows hot air... Join Date: May 2005 ... a low coolant level will exhibit the first stated symptoms of no heat/low heat at idle and increased heat at cruise due to an air ...

It could be your thermostat. If it is stuck open and you are driving in cold temperatures your car will not warm up properly. As for your heater, it shares the coolant from inside the engine and radiator so if your engine isn't warming up it won't warm up either.

I recently had the same problem with my car. The solution for me was to remove the coolant lines going into the firewall(be sure to let it cool down first)and blow out the heater core with compressed air.I went from blowing barely luke warm air to awesome heat...good luck